Sewing-machine



(No Model.) 2 Sheets-Sheet 2` E. M. STAPLES.

SEWING MACHINE.

10.580,0155J Patented Apr.6,189'/` Y Imm" M w il l y l? d N HNEK UNrTEDSTATES PATENT GFFICE.

ELIAI. M. STAPLES, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY, OF NEIV JERSEY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 580,015, dated April 6,1897. Application filed September 18, 1894. Serial No. 523.383. (Nomodel.)

To @ZZ whom t may con/cern:

Be it known that I, ELIAL M. STAPLES, a citizen of the United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Sewing-Machines, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

My invention relates to that class of sewing-machines which form thedouble-chain or Grover it Baker stitch, and has for its object toprovide a machine of the class referred to which will be simple inconstruction, so that it will be inexpensive to make, and in which themovements are strong and positive, so that the machine will be capableof running at high speed and with but little noise.

In the drawings, Figure l is a side view, partly in section, of myimproved machine.

Fig. 2 is a sectional view at the forward end of the work-supporting armon a larger scale than in Fig. 1. Fig. 3 is a front end view of themachine with the face-plate removed. Fig. 4 is a detail view of thelower-threadtake-up device. Figs. 5 and 6 are detail views to show thetrimming-blades. Figs. 7 and S are detail views of the feedingmechanism.

The framework of the machine consists of the base A, the standard A',the overhanging arm a, having the head a at its forward end, and thelower or work-s upporting arm a2. For some kinds of work a flatwork-plate is desirable, and this arm machine maybe converted into abed-plate machine by means of the flat work-plate a3, having a yoke a4,by which and the set-screw d5 said work-plate may be removably attachedto the arm a2.

B is the drivin g-shaft, j ournaled in the lower partof the frameworkand provided near its rear end with an eccentric connected by a pitman cto the rear end or arm of the needleoperating lever C, to the forwardend of which the needle-bar c is connected to be reciprocated verticallyin the head a', said needlebar carrying the usual eye-pointed needle c2.

D is a small rock-shaft journaled in a bearing in the forward end of thearm a2 and having an upwardly-extending arm d, which supports a sleevee, having a rounded or ball-like portion e to prevent binding at itspoint of connection to the arm d. The needle-operating lever C has adepending arm c3, to the lower end of which is jointed the rear end of arod E, carrying at its forward end the threadcarrying looper e2, saidrod E passing through the sleeve e. The rock-shaft D is provided at itsforward end with an arm d', slotted to embrace an eccentric Z9 on theforward end of the drivin g-shaft B, so that rotation of saiddriving-shaft causes a rocking movement to be imparted to the shaft D,and thus the looper-carrying rod E, passing through the sleeve e,carried by the arm d of said rockshaft, will be moved to and frolaterally by said arm as said rod is reciprocated longitudinally byreason of its connection with the arm c3 of the needle-lever, thuscausing the looper e2 to be moved forward on one side of the needle andbackward on the other side thereof, as is usual in double-chain-stitchmachines.

To the arm d of the rock-shaft D is attached a plate cl2, having afinger cl3, which, as the needle is rising, is moved against or closelyadjacent fo the front side of said needle to throw out or open the loopof needlethread on the rear or opposite side of the needle, so that theloop will be entered with certainty by the looper'ei?, which movesforward as the needle rises on the side of said needle opposite to thaton which said loop-forming finger d3 is placed.

The shaft B is provided with an eccentric b2, embraced by a yoke F,having a slotted arm f, jointed at its lower end to an arm g, fast onthe rear end of a tubular rock-shaft G,

surrounding said shaft B, and provided at its forward end with a secondrigid arm g. The slot of the arm f is entered by a pin or rollerstud tobe carried by a feed-regulating lever H, pivoted at h to a part of themachineframe and provided at its outer end with a milled set-nut h2 tohold said regulating-lever in any desired position of adjustment.

The arm g is embraced by lugs 'i on a horizontally-movable block orslide I, said lugs entering a horizontal guidegroove @6in the front endof the arm a2. The block or slide I is recessed for the reception of ablock K, vertically movable in said block I and carryioo device Lthrough thread-take-up eyes m,

formed in plates m, carried by the needlebar c and working on oppositesides of a bar n, provided with an opening in which is placed acheck-tension spring n', pressing lightly against the inner wall of theopening in the bar fn, so that the needle-thread passing through saidopening from one to the ,other of the eyes in the plates m will bemomentarily detained by said spring when the needle is descending, andthe slack will thus be controlled so that the thread will not get in theway of the point of the needle. This needle-thread-controlling mechanismis substantially the same as that which has long been in use in theWillcox & Gibbs machine, and its operation is therefore familiar tothose skilled in the art to which my invention relates.

Coperating with the above-described controlling device for theneedle-thread is a novel take-up device for the looper-thread which Iwill now describe.

Attached to the lower end of the arm c3 of the needle-bar-operatinglever C is a take-up device consisting, preferably, of a wire loop fr,bent at right angles to form a shoulder o, 1

and supported by a housing-plate P is a second wire loop p, said plate Phaving an opening or slot 1o', through which the said loop r extends andin which it reciprocates when the l machine is in operation.

S is a bent plate attached to the base A outside of the plate P andhaving a horizontal portion extending inward through the slot or opening1J of the said plate P, said horizontal portion of said plate S havingan inclined slot s, which is so arranged yrelative to the path ofmovement of the shoulder r of the loop r that as said loop isreciprocated with the arm c3 of the needle-bar-.operating lever and withthe looper-operating rod E, connected with said arm, said shoulder willcross from the inner -to the outer side -of said in-A clin ed slot.

The looper-thread runs from the tension device L' to the forward side ofthe upper limb or bar of the loop p, thence through said loop aroundrearward of the loop r land down through the inclined slot sof the plateS, andv thence forward below the said loop r and against the front edges of the plate S and through the hollow work-supporting arm a2 to 'thelooper e2, working in said arm. Thus as the said looper is making itsbackward movement after having passed its thread through a loop ofneedle-thread the slack of the looper-thread is taken up by the Wireloop-take-up device fr during a portion of the y backward travel of thesaid looper, but when` in the backward movement of the said take-A updevice the shoulder r thereof crosses over far enough to the front sideof the inclined slot s of the plate S to permit the thread to escapepast said shoulder into said slot the thread will be momentarilyslackened, so that the stitch will not be drawn too tight, and thus aslack or elastic stitch seam suitable for knit goods will be produced.As the thread after escaping past the shoulder fr' of the upper limb ofthe'wire loop r will still be held by the lower limb of said loop, (0W-ing to thedirection the thread takes in running from said loop upwardand forward past the front edge s' of the plate S,) 4the thread will berestored to proper position to repeat the above-described operation whenthe takeup loop r moves forward in unison with the looper. It will thusbe seen that I not only provide a take-up device for the lower threadwhich is moved in unison with the looper, but I also provide a take-updevice which is in a measure intermittent in its action, 'so that aslack-stitch seam may be produced. The timing of this slackening of thetake-up action of the looper-thread may be varied by providinginterchangeable plates S, having slots s of varying inclinations, or byany suitable or wellknown means of adjustment of the plate S, as will bereadily understood.

My improved machine is preferably provided with a trimming mechanism,which, as herein shown, consists of the blade q, carried by thetrimmer-bar Q, connected to an arm at the forward end of a rock-shaft T,journaled in the overhanging arm A and having an arm at its rear endconnected by a pitman t with an eccentric on the drivingshaft B. Thethroat-plate W is 4provided with a removable stationary blade w,cooperating with the movable blade q in the usual man-ner.

The hol-low work-supportingarma2 is open at its top for access lto thelooping mechanism, and is provided with a longitudinallyextendingcoverplate U, hinged at its rear end at u to the machine-frame at Ltherear end of said arm, said hinge being transverse to said arm, so thatsaid plate maybe lifted, denoted by dotted lines in Fig. 1.

Having thus described my invention, I claim and desire to secure byLetters Patent- 1. In a doublechainstitch sewing-machine, thecombination with the needle-bar and its operating-lever C, havingthedepending farm c3, of the looper-rod E connected to saidfarm, thelooper carried by said rod, the short rockshaft D at the forward end ofthe Work-support and having a jointed guide or support through whichsaid rod-extends and in which itreciprocates, and means for ,positivelyrockmg said shaft in both directions to impart IIO positiveback-and-forth lateral movements to said looper-rod and looper.

2. The combination with the needle-bar c', of the operating-lever Chaving the depending arm c3, the looper-rod E jointed at its rear end tosaid arm and provided at its front end with the looper e2,the rock-shaftI) having the arm d and the forked arm d', the sleeve e through Whichsaid looper-rod extends and which is jointed to and supported by saidarm d, and the driving-shaft B having an eccentric h Working in the forkof the said arm d' and serving to impart positive movements in bothdirections to said rock-shaft.

3. In adouble-chain-stitch sewing-machine, the combination With a needleand a looper and their operating mechanism, of a looperthread-take-updevice movable in unison With the said looper, as the latter isreciprocated longitudinally, said take-up device having a cast-offshoulder, and a plate having an inclined slot through which thelooper-thread runs, said inclined slot being so arranged as to cross theplane of movement of the said cast-off shoulder on said takeup device.

4. A take-np mechanism for double-chainstitch sewing-machines consistingof the combination with the needle-bar-operating lever having thedepending arm c3, of the Wire loop or device r attached to said arm andhaving the shoulder r', the plate P having the slot or opening p and theWire loop p, and the plate S having the inclined slot s so arranged asto cross the plane in which said shoulder r travels as said loop ordevice 1' is moved back and forth with said arm c3.

5. The combination With the driving-shaft B having the eccentric b2, ofthe yoke F embracing said eccentric and having the slotted arm f, therock-shaft G having an arm g to which said arm fis pivoted near the Aendof the latter, said shaft G having at its forward end the arm g', thefeed-regulating lever H pivoted to the machine-frame and having a pin orstud extending into the slot of the arm f, the horizontally-movableblock or slide I having lugs or parts embracing a portion of the saidarm g', the slide or blockK vertically movable in the said slide orblock I and carrying the feed-dog k, and the eccentric b for impartingvertical movements to the said slide or block K.

6. The combination with the needle-bar c', of the operating-lever Chaving the depending arm c3, the looper-rod E jointed at its rear end tosaid arm and provided at its front end with the looper e2, therock-shaft D having the rear arm d and the front forked arm CZ', thelatter being provided With the plate d2 having the loop-forming lingercl3 which extends past the needle on the side thereof oppositeto thatfrom which the said looper takes the loops of needle-thread, the sleevee through which said looper-rod extends, and Which is supported by saidarm d, and the driving-shaft B having the eccentric Z9 Working in thefork of the said arm d and serving to rock said shaft D.

In testimony whereof I affix my signature in presence of two Witnesses.

ELIAL M. STAPLES.

lVitnesses:

HENRY CALVER, J. F. JAQUITH.

